SAA-C03 Question 89
Single answerAn e-commerce company is running a web application on Amazon EC2 instances behind an Application Load Balancer (ALB) in a single Availability Zone. The company has been experiencing downtime during hardware failures in the Availability Zone. How can the company improve the resilience of the architecture to minimize downtime?
- A
Deploy the EC2 instances in multiple Availability Zones and configure the ALB to distribute traffic across them.
- B
Increase the size of the EC2 instances in the current Availability Zone to handle more traffic during failures.
- C
Replace the Application Load Balancer with a Network Load Balancer for higher reliability.
- D
Configure Auto Scaling to terminate and replace failed EC2 instances within the same Availability Zone.
Show answer and explanation
Correct answer: A
Explanation
To design a resilient architecture, it is critical to avoid single points of failure. By deploying EC2 instances in multiple Availability Zones and using the Application Load Balancer to distribute traffic, the application can continue to serve requests even if one Availability Zone becomes unavailable. This approach ensures high availability and fault tolerance, which are key principles of resilient architecture design.
- A. Correct.
Deploying EC2 instances in multiple Availability Zones and updating the ALB to distribute traffic across them improves resilience. If one Availability Zone fails, the application can continue running in the other zones.
- B. Incorrect.
Increasing the size of the EC2 instances in the same Availability Zone does not address the risk of downtime caused by a failure in the Availability Zone itself.
- C. Incorrect.
Replacing the Application Load Balancer with a Network Load Balancer does not inherently improve resilience to Availability Zone failures, as the issue is with the deployment of EC2 instances in a single zone.
- D. Incorrect.
While Auto Scaling can help replace failed EC2 instances, it does not address the issue of an entire Availability Zone becoming unavailable.